We've used a 2mm diameter, domestically-produced round leather cord. You can use it by threading your favorite pendant top, etc. (The part to thread through needs to be about 3mm in size.) The basic specifications are: Leather color: Black Metal fittings color: Silver Metal fittings type: Small plate clasp Length: 40cm The above are the basic specifications, but changes are possible upon request. If you wish to make changes, please see below and let us know after purchase. If we do not hear from you, we will create the item according to the above specifications. ・Length can be changed up to 50cm. This is the length including the metal fittings. For the adjuster type, the length can be adjusted by about 5cm. For lengths of 51cm or more, an additional 100 yen will be added for every 10cm, so please comment before purchasing. We will change the price. ・Choose from black, dark brown, natural, or brown for the leather cord color, and silver, gold, or antique for the metal fittings color. The color of the leather cord may vary slightly depending on the time of arrival and the environment in which you view it. Black and dark brown are similar colors. ・Choose from adjuster, small plate clasp, or large plate clasp for the metal fittings type. If you have multiple requests or want to add length, please let us know in the comments before purchasing. We will change the price. Please feel free to contact us if you have any questions. We do not offer discounts. Material: Leather Color: Black